cryogenics
From Longman Dictionary of Contemporary Englishcryogenicscry‧o‧gen‧ics /ˌkraɪəˈdʒenɪks/ noun [uncountable] the scientific study of very low temperatures —cryogenic adjectiveExamples from the Corpuscryogenics• This removes half of the cryogenics problem but leaves us with liquid oxygen.Origin cryogenics (1900-2000) cryogen “substance producing low temperatures” ((19-21 centuries)), from Greek kryo- (from kryos “very cold”) + English -gen “producing” (from Greek -genes “born”)